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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99b023a375f5e51a4b4db3801f2f20c9193eb5a7e9d9dcec4ebde4a7ba49dff' 
  AND token = 'cVaY6vtjlfVpIO8vbV5Qd2tzhNPB0cwURMJqFIRmd+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}